[LAU] xruns with m-audio fast track pro on fedora 8 ccrma ->kernel 2.6.22 , periods/buffer = 3 , proper rtirq setup, disable 2nd core

[Mysth-R]

2008/1/25, Florent Berthaut <hitmuri at no-log.org>:
>
>  Fernando Lopez-Lezcano a écrit :
>
>
> Ok finally, i tried to disable the second core ( i have a dual core
> 2GHz) and things get really better this way, i can lauch more
> applications with 4,8ms latency and no xruns. I had already disabled
> cpuspeed but it looks like it was not enough.
>
>  That points to a realtime kernel problem with (probably) timekeeping in
> two core processors (ie: "time of day" is not perfectly synchronized
> between the processors so that if jack migrates from one to another it
> appears as there has been too much delay and things don't work as
> intended). I have seen this happen in 2.6.23.x + rt14.
>
> What happens if you boot dual core with the "idle=poll" kernel
> parameter? (I assume this happens with 2.6.22.x).
>
> -- Fernando
>
>
> Looks like it solves the problem, even the 2.6.23.x (latest ccrma kernel)
> works well with this parameter.
> Thanks.
>
> Florent
>

Hi, I would like to know how did you disable your 2nd core ? Does it affect
the general performances ?
Thanks

Mysth-R

>
>


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